Major code reorganization

This commit only updates the XCode project for the changes.
A later commit each will update it for scons and MSVC.

A few actual changes are mixed in:
- Add a prefix header for a handful of common definitions
- Moved current_cursor into the Cursor class as a static member
- Removed the make_cursor_sword and make_cursor_watch functions
- Include tests in the All target
- Remove redundant -l flags for Common and Common-Party (since they're included in the Link phases anyway)

src/gfx/mask.vert

@@ -0,0 +1,10 @@
+
+uniform mat4 trans;
+
+void main() {
+    // transform the vertex position
+    gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
+	
+    // transform the texture coordinates
+    gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
+}